Require user authentication for remote connections by using Network Level Authentication

Our environment is comprised of a single forest with 4 child domains.

In one particualr domain I have setup a Windows server 2008 server and for some reason the policy
:
>>Require user authentication for remote connections by using Network Level Authentication
`
Seems to enable all by itself. I have disabled it and after a period of time it renables?

I have a duplicate server setup in another of our child domains and dont have any problem.

I have run rsop and the policy states that it is a local policy - which I find hard to understand after disabling it?:

I have checked all of the polcies and there are no settings enabled for this.

Any help appreciated.

Thanks in advance.

Thanks,
Andrew